OK , Tom
I will heed your advise on not using any wallwarts.
Construction has stopped until I aquire a suitable
PS. I will look into the Knwd PS-12 as you
suggested.. Many thanks friend, and
Happy Valentines Day!
Dennis Vavra, AD5LY
___
Elecraft mailing
OK Don,
Every other indication and test checks out. I am
building this K2 at a very slow methodical pace.
The thinner gauge solder (0.20in) and new mag lamp
have been a great help.I am moving on to the
thermistor board now!! Many thanks for your
assistance. Dennis Vavra, AD5LY
___
Dennis,
That may be OK for a 500 ma. wall wart. Unless it is one of the rare
regulated wall warts, the low current voltage will be quite high and when
loaded to half is capability (approximately .25 Amps), the voltage can sag
quite a bit. Remember that there is a protective diode in series insid
Hi Tom,
I reheated some more solder joints, on the contrl bd, and reheated R115 on the
RF bd as well.Am now using another "wall wart"
rated at 12v DC and 500ma. The reading at the back of the K2 (DC barrell
connector), showed 12.6v DC.
The Bargraph Current Test Shows E12.6, 0.06 for step 4...an
Dennis,
That should be OK - 0.06 amps plus a 0.16 amp increase is 0.22 Amps, just
like the manual indicates.
OTOH, I am concerned about the fact that the displayed voltage drops so
much. If you have a 'wimpy' power supply connected that might be expected,
but if your power supply is substantial,
Thanks for the advise Tom, and Don. I resoldered around the current sense area
of cntl bd, and checked for
bad soldering. Also verified that shorting jumper is shorting pins 2&3 of P7. I
tried another power supply,
and in step 4 of the test on page 47 I have reading of E13.6, 0.06.and in
ste
Dennis,
First of all, you voltage is dropping a full volt (unless that was a typo),
and strange readings like that are usually the result of poor solder
connections. Reflow all your solder connections, adding a bit of flux from
new solder to wet the joint. You should be doing the reflow with an
In conducting the Bargraph Current Test on Page 47 of K2 manual, step 4 of the
test, my reading
was E15.3, 0.08 and the raading on step 6 was E14.3, 0.02. Step 6 reading
says it should be higher
than the step 4 reading 0.16 to 0.18 amps. Iv'e conducted the test multiple
times and cant unders
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